A lot of other blogs have mentioned this, so many of my readers may already be aware of the wonderful 2012 stamp-a-day preview from Beyond the perf, the USA Philatelic website.
But this may indeed be news to you. If you haven't checked it out, you really should; each weekday at 7:30am, they release a preview of a 2012 stamp to be released, with photo and description. They only skip holidays and new stamp release days, so it's a great way to stay current with the new releases, too.
I find myself popping over to the site every day just to get a glimpse of the future stamp for that day... it's a neat gimmick, and a great publicity method. You can also see all the previous stamps they've previewed there, too, to play catch-up.
Take me to the 2012 stamp-a-day preview!